Zinc selenide (ZnSe) is a very good infrared material with a wide range of light transmission, from 0.5 microns to 19 microns. Because zinc selenide has a very low absorption coefficient in the 1064nm band, has good imaging characteristics and thermal shock characteristics, it is often used as a lens and window for carbon dioxide lasers. At the same time, the excellent optical properties of zinc selenide lenses are also widely used as windows, optical lenses and Optical Prisms of high-definition forward-looking infrared systems. Laser Focusing Lens,Optical Lasers,Laser Lens,Lasers In Optics Changchun Realpoo Photoelectric Co., Ltd. , https://www.optics-realpoo.com
Commonly used formula for integrated wiring
The commonly used formula for integrated wiring RJ-45 head demand: m=n*4+n*4*15% m: indicates the total demand of RJ-45 connector n: indicates the total amount of information points n*4*15% : indicates the demand for the surplus information module left: m=n+n*3% m: indicates the total demand of the information module n: indicates the total amount of information points n*3%: indicates the amount of surplus per floor Quantity: C=[0.55*(L+S)+6]*n L: Distance from the most information point on the floor from the management room S: Distance from the nearest information point of the floor from the management room n: Total number of information points on the floor 0.55: Standby factor 6: Termination tolerance When selecting the slot, the cross-sectional area of ​​the slot = horizontal cable area × 3 1 (the longest line spacing + the shortest line spacing) / 2 = average (average +5 meters) X points = total length total length / 305 (standard per box of meters) + 2 boxes = total number of boxes + the number can also be set by themselves, the first time, would rather prepare more points, do not afterwards 2 Service requires a pair of 4 pairs of unshielded twisted pair